I can assist with linking case fans.
I can assist with linking case fans.
You should consider a fan hub or splitter based on your setup. Your motherboard supports two sys fan pins, but you have multiple fans with different connectors. The front has two 140mm PWM a-RGB fans and one Arctic P12 in the back. Your case uses Lian Li Lancool 205M with two 140mm fans. Each front fan also has two 3-pin plugs, which are unclear to you. You may need help connecting them properly.
It depends on your setup. If you have two fan headers on your motherboard and three case fans, a fan splitter or hub can help distribute power to the additional fans.
A splitter works well with the 140mm fans, it's perfectly fine. The header provides 12v, which is enough for the two units.
This device should function as a fan splitter, directing airflow to multiple outlets.